46 Mental disorders SchizophreniaUp until the 1960’s: parents seen as causes of schizophreniaDramatic increase in probability if one parent suffers from schizophreniaOdds are for monozygotic twin if the other twin has a schizophreniaBut: schizophrenic twin can have brain anomalies that the healthy twin does not haveHøy arvelighet også for bipolare lidelserAngst og depresjon: 30%